Jeep 68166540AA Sensor-Knock

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To disconnect the knock sensors, disconnect the cable(s) from the negative battery terminal(s). For the 3.6L V6, remove the intake manifolds and disconnect the electrical connector before removing the sensor(s) mounting bolt(s). Finally, install the knock sensor(s) by reversing the removal process.

The sensor nearest the front of the engine is Sensor no. 1 and the sensor nearest the rear of the engine is Sensor no.2.

Due to the work involved, both knock sensors should be replaced at the same time. To replace the knock sensor(s), relieve the fuel system pressure and drain the cooling system. Disconnect the negative battery cable. On 2007 2.7L engines, remove the cylinder head from the rear cylinder bank. On 2008 and later 2.7L engines and all 3.5L and 3.6L engines, remove the lower intake manifold. On 3.6L engines, also remove the engine oil filter housing. On 2.4L engines, remove the intake manifold (2014 and earlier) or the exhaust manifold (2015 and later). Disconnect the electrical connector(s) from the knock sensor(s). Remove the mounting bolt(s) and detach the sensor(s) from the engine block. Installation is the reverse of removal. Tighten the knock sensor to the specified torque. On V6 engines, refill the cooling system.

Disconnect the electrical connector from the knock sensor.

To diagnose the Throttle Position Sensor (TPS), disconnect the electrical connector, use a digital ohmmeter to check the resistance readings while moving the throttle lever, and replace the TPS if readings are incorrect.

To replace the knock sensors, start by disconnecting the cable from the negative battery terminal. Then, disconnect the knock sensor electrical connector, which is located at the rear of the engine, behind the intake manifold. If you can't find the connector, wait until you have removed the intake manifold and locate the two knock sensors and trace their leads back to the common connector. Remove the intake manifold and then remove the knock sensor assembly by removing the mounting bolts. Make sure to clean the holes for the mounting bolts before installing the new knock sensor assembly. For 3.7L V6 engines, note that the left knock sensor is identified by an identification tag and has a larger mounting bolt. Do not install the left knock sensor in the right sensor mounting position and vice versa, as it will confuse the PCM and cause a Diagnostic Trouble Code. Installation is the reverse of removal, making sure to tighten the knock sensor mounting bolts to the common connector. Remove the intake manifold and then remove the knock sensor assembly by removing the mounting bolts. Make sure to clean the holes for the mounting bolts before installing the new knock sensor assembly. For 3.7L V6 engines, note that the left knock sensor is identified by an identification tag and has a larger mounting bolt. Do not install the left knock sensor in the right sensor mounting position and vice versa, as it will confuse the PCM and cause a Diagnostic Trouble Code. Installation is the reverse of removal, making sure to tighten the knock sensor mounting bolts to the correct torque.